fea8707db3
MFC after: 1 month
454 lines
14 KiB
C
454 lines
14 KiB
C
/*
|
|
* Copyright (c) 1994, 1995, 1996
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the Computer Systems
|
|
* Engineering Group at Lawrence Berkeley Laboratory.
|
|
* 4. Neither the name of the University nor of the Laboratory may be used
|
|
* to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef pcap_int_h
|
|
#define pcap_int_h
|
|
|
|
#include <pcap/pcap.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifdef WIN32
|
|
#include <Packet32.h>
|
|
extern CRITICAL_SECTION g_PcapCompileCriticalSection;
|
|
#endif /* WIN32 */
|
|
|
|
#ifdef MSDOS
|
|
#include <fcntl.h>
|
|
#include <io.h>
|
|
#endif
|
|
|
|
#if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/
|
|
|
|
/*
|
|
* Swap byte ordering of unsigned long long timestamp on a big endian
|
|
* machine.
|
|
*/
|
|
#define SWAPLL(ull) ((ull & 0xff00000000000000) >> 56) | \
|
|
((ull & 0x00ff000000000000) >> 40) | \
|
|
((ull & 0x0000ff0000000000) >> 24) | \
|
|
((ull & 0x000000ff00000000) >> 8) | \
|
|
((ull & 0x00000000ff000000) << 8) | \
|
|
((ull & 0x0000000000ff0000) << 24) | \
|
|
((ull & 0x000000000000ff00) << 40) | \
|
|
((ull & 0x00000000000000ff) << 56)
|
|
|
|
#else /* A recent Visual studio compiler or not VC */
|
|
|
|
/*
|
|
* Swap byte ordering of unsigned long long timestamp on a big endian
|
|
* machine.
|
|
*/
|
|
#define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \
|
|
((ull & 0x00ff000000000000LL) >> 40) | \
|
|
((ull & 0x0000ff0000000000LL) >> 24) | \
|
|
((ull & 0x000000ff00000000LL) >> 8) | \
|
|
((ull & 0x00000000ff000000LL) << 8) | \
|
|
((ull & 0x0000000000ff0000LL) << 24) | \
|
|
((ull & 0x000000000000ff00LL) << 40) | \
|
|
((ull & 0x00000000000000ffLL) << 56)
|
|
|
|
#endif /* _MSC_VER */
|
|
|
|
/*
|
|
* Maximum snapshot length.
|
|
*
|
|
* Somewhat arbitrary, but chosen to be:
|
|
*
|
|
* 1) big enough for maximum-size Linux loopback packets (65549)
|
|
* and some USB packets captured with USBPcap:
|
|
*
|
|
* http://desowin.org/usbpcap/
|
|
*
|
|
* (> 131072, < 262144)
|
|
*
|
|
* and
|
|
*
|
|
* 2) small enough not to cause attempts to allocate huge amounts of
|
|
* memory; some applications might use the snapshot length in a
|
|
* savefile header to control the size of the buffer they allocate,
|
|
* so a size of, say, 2^31-1 might not work well.
|
|
*
|
|
* We don't enforce this in pcap_set_snaplen(), but we use it internally.
|
|
*/
|
|
#define MAXIMUM_SNAPLEN 262144
|
|
|
|
struct pcap_opt {
|
|
char *source;
|
|
int timeout; /* timeout for buffering */
|
|
int buffer_size;
|
|
int promisc;
|
|
int rfmon; /* monitor mode */
|
|
int immediate; /* immediate mode - deliver packets as soon as they arrive */
|
|
int tstamp_type;
|
|
int tstamp_precision;
|
|
};
|
|
|
|
typedef int (*activate_op_t)(pcap_t *);
|
|
typedef int (*can_set_rfmon_op_t)(pcap_t *);
|
|
typedef int (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *);
|
|
typedef int (*inject_op_t)(pcap_t *, const void *, size_t);
|
|
typedef int (*setfilter_op_t)(pcap_t *, struct bpf_program *);
|
|
typedef int (*setdirection_op_t)(pcap_t *, pcap_direction_t);
|
|
typedef int (*set_datalink_op_t)(pcap_t *, int);
|
|
typedef int (*getnonblock_op_t)(pcap_t *, char *);
|
|
typedef int (*setnonblock_op_t)(pcap_t *, int, char *);
|
|
typedef int (*stats_op_t)(pcap_t *, struct pcap_stat *);
|
|
#ifdef WIN32
|
|
typedef int (*setbuff_op_t)(pcap_t *, int);
|
|
typedef int (*setmode_op_t)(pcap_t *, int);
|
|
typedef int (*setmintocopy_op_t)(pcap_t *, int);
|
|
typedef Adapter *(*getadapter_op_t)(pcap_t *);
|
|
#endif
|
|
typedef void (*cleanup_op_t)(pcap_t *);
|
|
|
|
/*
|
|
* We put all the stuff used in the read code path at the beginning,
|
|
* to try to keep it together in the same cache line or lines.
|
|
*/
|
|
struct pcap {
|
|
/*
|
|
* Method to call to read packets on a live capture.
|
|
*/
|
|
read_op_t read_op;
|
|
|
|
/*
|
|
* Method to call to read to read packets from a savefile.
|
|
*/
|
|
int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **);
|
|
|
|
#ifdef WIN32
|
|
ADAPTER *adapter;
|
|
LPPACKET Packet;
|
|
int nonblock;
|
|
#else
|
|
int fd;
|
|
int selectable_fd;
|
|
#endif /* WIN32 */
|
|
|
|
/*
|
|
* Read buffer.
|
|
*/
|
|
int bufsize;
|
|
u_char *buffer;
|
|
u_char *bp;
|
|
int cc;
|
|
|
|
int break_loop; /* flag set to force break from packet-reading loop */
|
|
|
|
void *priv; /* private data for methods */
|
|
|
|
int swapped;
|
|
FILE *rfile; /* null if live capture, non-null if savefile */
|
|
int fddipad;
|
|
struct pcap *next; /* list of open pcaps that need stuff cleared on close */
|
|
|
|
/*
|
|
* File version number; meaningful only for a savefile, but we
|
|
* keep it here so that apps that (mistakenly) ask for the
|
|
* version numbers will get the same zero values that they
|
|
* always did.
|
|
*/
|
|
int version_major;
|
|
int version_minor;
|
|
|
|
int snapshot;
|
|
int linktype; /* Network linktype */
|
|
int linktype_ext; /* Extended information stored in the linktype field of a file */
|
|
int tzoff; /* timezone offset */
|
|
int offset; /* offset for proper alignment */
|
|
int activated; /* true if the capture is really started */
|
|
int oldstyle; /* if we're opening with pcap_open_live() */
|
|
|
|
struct pcap_opt opt;
|
|
|
|
/*
|
|
* Place holder for pcap_next().
|
|
*/
|
|
u_char *pkt;
|
|
|
|
/* We're accepting only packets in this direction/these directions. */
|
|
pcap_direction_t direction;
|
|
|
|
/*
|
|
* Placeholder for filter code if bpf not in kernel.
|
|
*/
|
|
struct bpf_program fcode;
|
|
|
|
char errbuf[PCAP_ERRBUF_SIZE + 1];
|
|
int dlt_count;
|
|
u_int *dlt_list;
|
|
int tstamp_type_count;
|
|
u_int *tstamp_type_list;
|
|
int tstamp_precision_count;
|
|
u_int *tstamp_precision_list;
|
|
|
|
struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
|
|
|
|
/*
|
|
* More methods.
|
|
*/
|
|
activate_op_t activate_op;
|
|
can_set_rfmon_op_t can_set_rfmon_op;
|
|
inject_op_t inject_op;
|
|
setfilter_op_t setfilter_op;
|
|
setdirection_op_t setdirection_op;
|
|
set_datalink_op_t set_datalink_op;
|
|
getnonblock_op_t getnonblock_op;
|
|
setnonblock_op_t setnonblock_op;
|
|
stats_op_t stats_op;
|
|
|
|
/*
|
|
* Routine to use as callback for pcap_next()/pcap_next_ex().
|
|
*/
|
|
pcap_handler oneshot_callback;
|
|
|
|
#ifdef WIN32
|
|
/*
|
|
* These are, at least currently, specific to the Win32 NPF
|
|
* driver.
|
|
*/
|
|
setbuff_op_t setbuff_op;
|
|
setmode_op_t setmode_op;
|
|
setmintocopy_op_t setmintocopy_op;
|
|
getadapter_op_t getadapter_op;
|
|
#endif
|
|
cleanup_op_t cleanup_op;
|
|
};
|
|
|
|
/*
|
|
* This is a timeval as stored in a savefile.
|
|
* It has to use the same types everywhere, independent of the actual
|
|
* `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
|
|
* platforms and 64-bit tv_sec values on other platforms, and writing
|
|
* out native `struct timeval' values would mean files could only be
|
|
* read on systems with the same tv_sec size as the system on which
|
|
* the file was written.
|
|
*/
|
|
|
|
struct pcap_timeval {
|
|
bpf_int32 tv_sec; /* seconds */
|
|
bpf_int32 tv_usec; /* microseconds */
|
|
};
|
|
|
|
/*
|
|
* This is a `pcap_pkthdr' as actually stored in a savefile.
|
|
*
|
|
* Do not change the format of this structure, in any way (this includes
|
|
* changes that only affect the length of fields in this structure),
|
|
* and do not make the time stamp anything other than seconds and
|
|
* microseconds (e.g., seconds and nanoseconds). Instead:
|
|
*
|
|
* introduce a new structure for the new format;
|
|
*
|
|
* send mail to "tcpdump-workers@lists.tcpdump.org", requesting
|
|
* a new magic number for your new capture file format, and, when
|
|
* you get the new magic number, put it in "savefile.c";
|
|
*
|
|
* use that magic number for save files with the changed record
|
|
* header;
|
|
*
|
|
* make the code in "savefile.c" capable of reading files with
|
|
* the old record header as well as files with the new record header
|
|
* (using the magic number to determine the header format).
|
|
*
|
|
* Then supply the changes by forking the branch at
|
|
*
|
|
* https://github.com/the-tcpdump-group/libpcap/issues
|
|
*
|
|
* and issuing a pull request, so that future versions of libpcap and
|
|
* programs that use it (such as tcpdump) will be able to read your new
|
|
* capture file format.
|
|
*/
|
|
|
|
struct pcap_sf_pkthdr {
|
|
struct pcap_timeval ts; /* time stamp */
|
|
bpf_u_int32 caplen; /* length of portion present */
|
|
bpf_u_int32 len; /* length this packet (off wire) */
|
|
};
|
|
|
|
/*
|
|
* How a `pcap_pkthdr' is actually stored in savefiles written
|
|
* by some patched versions of libpcap (e.g. the ones in Red
|
|
* Hat Linux 6.1 and 6.2).
|
|
*
|
|
* Do not change the format of this structure, in any way (this includes
|
|
* changes that only affect the length of fields in this structure).
|
|
* Instead, introduce a new structure, as per the above.
|
|
*/
|
|
|
|
struct pcap_sf_patched_pkthdr {
|
|
struct pcap_timeval ts; /* time stamp */
|
|
bpf_u_int32 caplen; /* length of portion present */
|
|
bpf_u_int32 len; /* length this packet (off wire) */
|
|
int index;
|
|
unsigned short protocol;
|
|
unsigned char pkt_type;
|
|
};
|
|
|
|
/*
|
|
* User data structure for the one-shot callback used for pcap_next()
|
|
* and pcap_next_ex().
|
|
*/
|
|
struct oneshot_userdata {
|
|
struct pcap_pkthdr *hdr;
|
|
const u_char **pkt;
|
|
pcap_t *pd;
|
|
};
|
|
|
|
int yylex(void);
|
|
|
|
#ifndef min
|
|
#define min(a, b) ((a) > (b) ? (b) : (a))
|
|
#endif
|
|
|
|
/* XXX should these be in pcap.h? */
|
|
int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
|
|
int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
|
|
|
|
#ifndef HAVE_STRLCPY
|
|
#define strlcpy(x, y, z) \
|
|
(strncpy((x), (y), (z)), \
|
|
((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
|
|
strlen((y)))
|
|
#endif
|
|
|
|
#include <stdarg.h>
|
|
|
|
#if !defined(HAVE_SNPRINTF)
|
|
#define snprintf pcap_snprintf
|
|
extern int snprintf (char *, size_t, const char *, ...);
|
|
#endif
|
|
|
|
#if !defined(HAVE_VSNPRINTF)
|
|
#define vsnprintf pcap_vsnprintf
|
|
extern int vsnprintf (char *, size_t, const char *, va_list ap);
|
|
#endif
|
|
|
|
/*
|
|
* Does the packet count argument to a module's read routine say
|
|
* "supply packets until you run out of packets"?
|
|
*/
|
|
#define PACKET_COUNT_IS_UNLIMITED(count) ((count) <= 0)
|
|
|
|
/*
|
|
* Routines that most pcap implementations can use for non-blocking mode.
|
|
*/
|
|
#if !defined(WIN32) && !defined(MSDOS)
|
|
int pcap_getnonblock_fd(pcap_t *, char *);
|
|
int pcap_setnonblock_fd(pcap_t *p, int, char *);
|
|
#endif
|
|
|
|
/*
|
|
* Internal interfaces for "pcap_create()".
|
|
*
|
|
* "pcap_create_interface()" is the routine to do a pcap_create on
|
|
* a regular network interface. There are multiple implementations
|
|
* of this, one for each platform type (Linux, BPF, DLPI, etc.),
|
|
* with the one used chosen by the configure script.
|
|
*
|
|
* "pcap_create_common()" allocates and fills in a pcap_t, for use
|
|
* by pcap_create routines.
|
|
*/
|
|
pcap_t *pcap_create_interface(const char *, char *);
|
|
pcap_t *pcap_create_common(const char *, char *, size_t);
|
|
int pcap_do_addexit(pcap_t *);
|
|
void pcap_add_to_pcaps_to_close(pcap_t *);
|
|
void pcap_remove_from_pcaps_to_close(pcap_t *);
|
|
void pcap_cleanup_live_common(pcap_t *);
|
|
int pcap_not_initialized(pcap_t *);
|
|
int pcap_check_activated(pcap_t *);
|
|
|
|
/*
|
|
* Internal interfaces for "pcap_findalldevs()".
|
|
*
|
|
* "pcap_findalldevs_interfaces()" finds interfaces using the
|
|
* "standard" mechanisms (SIOCGIFCONF, "getifaddrs()", etc.).
|
|
*
|
|
* "pcap_platform_finddevs()" is a platform-dependent routine to
|
|
* add devices not found by the "standard" mechanisms.
|
|
*
|
|
* "pcap_add_if()" adds an interface to the list of interfaces, for
|
|
* use by various "find interfaces" routines.
|
|
*/
|
|
int pcap_findalldevs_interfaces(pcap_if_t **, char *);
|
|
int pcap_platform_finddevs(pcap_if_t **, char *);
|
|
int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
|
|
size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
|
|
struct sockaddr *, size_t, char *);
|
|
int add_addr_to_dev(pcap_if_t *, struct sockaddr *, size_t,
|
|
struct sockaddr *, size_t, struct sockaddr *, size_t,
|
|
struct sockaddr *dstaddr, size_t, char *errbuf);
|
|
int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
|
|
struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
|
|
int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
|
|
const char *, char *);
|
|
|
|
/*
|
|
* Internal interfaces for "pcap_open_offline()".
|
|
*
|
|
* "pcap_open_offline_common()" allocates and fills in a pcap_t, for use
|
|
* by pcap_open_offline routines.
|
|
*
|
|
* "sf_cleanup()" closes the file handle associated with a pcap_t, if
|
|
* appropriate, and frees all data common to all modules for handling
|
|
* savefile types.
|
|
*/
|
|
pcap_t *pcap_open_offline_common(char *ebuf, size_t size);
|
|
void sf_cleanup(pcap_t *p);
|
|
|
|
/*
|
|
* Internal interfaces for both "pcap_create()" and routines that
|
|
* open savefiles.
|
|
*
|
|
* "pcap_oneshot()" is the standard one-shot callback for "pcap_next()"
|
|
* and "pcap_next_ex()".
|
|
*/
|
|
void pcap_oneshot(u_char *, const struct pcap_pkthdr *, const u_char *);
|
|
|
|
#ifdef WIN32
|
|
char *pcap_win32strerror(void);
|
|
#endif
|
|
|
|
int install_bpf_program(pcap_t *, struct bpf_program *);
|
|
|
|
int pcap_strcasecmp(const char *, const char *);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|